The complete source code for the Sci-Fi racer H-Craft Championship is now availabe at irrgheist.com/hcraftsource.
It uses the same liberal zlib license like Irrlicht. The game runs on Window, Linux and Android. Check this thread in the forum to discuss the sources. If you want to take a quick look at the game itself you can find screenshots, videos, binaries and an Android version at irrgheist.com/games and there is also another forum thread about the game.